What did you expect them to tell you... Yes, we screwed up on that, or we just want to save money. It's forced air... it will breathe if it has to lift the lid due to pressure. Simple physics, it will find an escape. If concerned, add another smoke stack like I did and Rec teq should so your grill temp is better distributed. You can always close down on the cap if you feel the need... and it looks good too.
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